AVE6320297: United States, 1980s: scientist looks at petri dishes under microscope / Bridgeman Images

AVE6320299: United States, 1980s: micro cinematography of leucocytes in blood vessels / Bridgeman Images

AVE6320300: United States, 1980s: normal cells divide in situ / Bridgeman Images

AVE6320306: United States, 1980s: animation of immune system in human body / Bridgeman Images

AVE6320310: United States, 1980s: defender cell makes cells to help kill invader / Bridgeman Images

AVE6320316: United States, 1980s: cartoon phagocyte eats virus / Bridgeman Images

AVE6320317: United States, 1980s: suppressor cell cartoon character produces lymphtoxin / Bridgeman Images

AVE6320324: United States, 1980s: close up blood pressure cuff on female patient / Bridgeman Images

AVE6319665: Count Down Clock / Bridgeman Images

AVE6319667: Apollo Landing on the Moon / Bridgeman Images

AVE6319668: Women Testing Out New Spacesuits / Bridgeman Images

AVE6319671: Communications Satellite Being Deployed in Space / Bridgeman Images

AVE6319674: Space Ship Arm Being Built and Tested on Earth / Bridgeman Images

AVE6319676: 1890s: News title / Bridgeman Images

AVE6319680: Sally Ride Learns How to Navigate and Manage G Forces wihilst Flying / Bridgeman Images

AVE6319691: 1910s: Birds circle in sky / Bridgeman Images

AVE6319692: Female Astronauts in Vomit Comet Training / Bridgeman Images

AVE6319696: Space Shuttle Flying Over Earth / Bridgeman Images

AVE6319701: Sally Ride Talking to Camera About Human Body and Materials Research in Space / Bridgeman Images

AVE6319712: 1930s: Men unload parcels from plane / Bridgeman Images

AVE6319714: 1930s: Two men with standing missile / Bridgeman Images

AVE6319721: 1950s: Rocket base / Bridgeman Images

AVE6319743: 1960s: John F. Kennedy speaks at podium / Bridgeman Images

AVE6319744: 1960s: John F. Kennedy speaks at podium / Bridgeman Images

AVE6319746: 1960s: Crowd, women cheer / Bridgeman Images

AVE6319753: 1960s: Man sorts cables / Bridgeman Images

AVE6319754: 1960s: Men around spaceship nose / Bridgeman Images

AVE6319761: 1969: Surface of moon approaches as spacecraft lands / Bridgeman Images

AVE6319762: 1969: Surface of moon approaches as spacecraft lands, closes in on spacecraft's shadow / Bridgeman Images

AVE6319770: After dough is baked into bread, an oven dumper places the bread into a belt leading to a cooling room / Bridgeman Images

AVE6319777: A woman kneads dough and pulls it out of the oven after it has cooked / Bridgeman Images

AVE6319788: Baked bread is delivered to restaurants except in some bakeries who bake their own bread / Bridgeman Images

AVE6319789: Skilled bakers in a small doing mostly manual labor as opposed to a manufacturing setting / Bridgeman Images

AVE6319794: A woman places frosting on baked cakes / Bridgeman Images

AVE6319797: Different institutes for learning baking in the United States / Bridgeman Images

AVE6319814: 1970s man writes on clipboard in space capsule control center / Bridgeman Images